SmogRank / United States / California / Temecula

Temecula, month by month

Temecula has a measured daily mean on 698 days since 11 January 2023. Its worst month was July 2026, at 50 US AQI (9.0 µg/m³), 1,604th of 2,784 cities on that month's world ranking. Its cleanest was March 2025, at 21 US AQI (3.8 µg/m³).

Every month since 2023

202636 so far265 days measured2,399th of 2,791 in the world
Jan22#2,507Feb18 daysMar31#2,600Apr29#2,423May43#1,413Jun40#1,374Jul50#1,604Aug42#1,859Sep36#1,535Oct32#1,845
202533 for the year305 days measured2,360th of 2,681 in the world
Jan32#2,066Feb26#2,450Mar21#2,691Apr17 daysMay48#1,184Jun18 daysJul34#2,236Aug49#1,517Sep27#2,646Oct29#1,916Nov29#2,349Dec11 days
2024too few days for a mean (a year needs 257)72 days measured
JannoneFeb1 dayMar1 dayAprnoneMaynoneJunnoneJulnoneAugnoneSepnoneOct16 daysNov25#2,396Dec32#2,139
2023too few days for a mean (a year needs 256)56 days measured
Jan7 daysFeb27#1,068Mar20 daysApr3 daysMaynoneJunnoneJul1 dayAugnoneSepnoneOctnoneNovnoneDecnone
Each square is a month's mean PM2.5 in US AQI from Temecula's measured days, with its place on that month's world ranking under it. A month has a mean once 70% of its days are measured, the rule the monthly rankings use; under that, the square gives the days measured. Each square opens that month's ranking with Temecula marked; each year, the year's. A dashed square is the running month, so far.
Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+

The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales

Months without a mean, and why

25 months
MonthWhy
Feb 202618 of 28 days measured; a month needs 20. The others: 10 with under 18 hours of readings or readings that failed our checks.
Dec 202511 of 31 days measured; a month needs 22. The others: 20 with under 18 hours of readings or readings that failed our checks.
Jun 202518 of 30 days measured; a month needs 21. The others: 12 with under 18 hours of readings or readings that failed our checks.
Apr 202517 of 30 days measured; a month needs 21. The others: 13 with under 18 hours of readings or readings that failed our checks.
Oct 202416 of 31 days measured; a month needs 22. The others: 15 with under 18 hours of readings or readings that failed our checks.
Sep 2024No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
Aug 2024No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Jul 2024No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Jun 2024No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
May 2024No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Apr 2024No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
Mar 20241 of 31 days measured; a month needs 22. The others: 30 with under 18 hours of readings or readings that failed our checks.
Feb 20241 of 29 days measured; a month needs 21. The others: 28 with under 18 hours of readings or readings that failed our checks.
Jan 2024No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Dec 2023No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Nov 2023No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
Oct 2023No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Sep 2023No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
Aug 2023No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Jul 20231 of 31 days measured; a month needs 22. The others: 30 with under 18 hours of readings or readings that failed our checks.
Jun 2023No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
May 2023No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Apr 20233 of 30 days measured; a month needs 21. The others: 27 with under 18 hours of readings or readings that failed our checks.
Mar 202320 of 31 days measured; a month needs 22. The others: 11 with under 18 hours of readings or readings that failed our checks.
Jan 20237 of 31 days measured; a month needs 22. The others: 14 with under 18 hours of readings or readings that failed our checks.

A day counts once 18 hours of it are measured; a month needs 70% of its days.

Temecula's worst months

MonthUS AQIDays measuredWorld rank
July 2026 509.0 µg/m³31 of 311,604thof 2,784
August 2025 498.9 µg/m³31 of 311,517thof 2,901
May 2025 488.6 µg/m³31 of 311,184thof 2,826
May 2026 437.7 µg/m³31 of 311,413thof 2,874
August 2026 427.5 µg/m³31 of 311,859thof 2,896
June 2026 407.2 µg/m³26 of 301,374thof 2,497

Monthly means over the days measured; finished months only. World rank: its place on that month's world ranking of every city with enough days. Each month opens that ranking.

Temecula's worst days

DayUS AQI
31 May 2025 12746.2 µg/m³
17 May 2026 7019.5 µg/m³
7 Jul 2026 7019.5 µg/m³
6 Jul 2026 6818.4 µg/m³
5 Aug 2025 6617.2 µg/m³
4 Aug 2025 6516.6 µg/m³
20 May 2026 6215.0 µg/m³
18 May 2026 6114.2 µg/m³
6 Aug 2025 6014.1 µg/m³
30 May 2025 6013.7 µg/m³

Daily means, the highest since 11 Jan 2023; the WHO's daily guideline is 15 µg/m³. Each date opens that day's world ranking, and each episode the bad-air spell it was part of.

Use this history

SmogRank, PM2.5 monthly and daily means, Temecula, United States, 11 Jan 2023 – 11 Oct 2026. Monitor data from AirNow, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/us/temecula/history (accessed 12 Oct 2026).

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You're welcome to reuse a single chart, image or figure with this citation and a link. Terms. Raw monitor readings in bulk are published by OpenAQ, under each provider's licence.

Temecula now: the last 24 hours, its ranks today and the last 12 months day by day.

Updated 2026-10-12 17:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index. Some low-cost readings: Sensor.Community, ODbL (data and licence). Some readings: Uzhydromet (Uzbekistan's Hydrometeorological Service); Department of Environment, Nepal; Vietnam's government monitors; Aurassure; Umhverfisstofnun (Environment Agency of Iceland); RMCAB (Secretaría Distrital de Ambiente, Bogotá); Love My Air (City and County of Denver), no reuse terms published (why we use them).